Anne Beddingfeld is a nice English girl looking for a bit of adventure. But she stumbles upon more than she bargained for! A beautiful ballet dancer is brutally murdered in a London mansion. A fabulous fortune in diamonds has vanished. And now, aboard the luxury liner "Kilmorden Castle," mysterious strangers pillage her cabin and try to strangle her. What are they looking for? Why should they want her dead? Lovely Anne is the last person on earth suited to solve this mystery...and the only one who can!